I'm running Thrushmoor Terror now, and the random Kuru enemies just seem... out of place. I'm fine with some savagery, but they don't make sense, narrative-wise. Anyone know some interesting monsters or NPCs I can use to substitute them? Preferably around the same CR, but I don't mind tweaking up or down a little. Anything goes: extraplanar entities (though I don't really see them summoning devils or demons), magical beasts, undead, and so on. As long as they're relatively clever and can do a decent job of guarding the place.
Deep-one hybrids are an easy substitution and are part of the Mythos.